The British Army of 1914-1918 sometimes used very confusing terminology. Army Troops was a term given to any unit (which could be infantry, engineers, artillery etc) that was under the direct command of an Army HQ, as opposed to the command of one of it's subsidiary units such as a Corps. Thus a Field Artillery Brigade was called an Army Brigade if it reported to the Commander, Royal Artillery of an Army. An Army Troops Company of the Roayl Engineers reported to the Commander, Royal Engineers, of an Army.

Similarly, Corps Troops was a term given to any unit (which could be infantry, engineers, artillery etc) that was under the direct command of a Corps HQ, as opposed to the command of one of it's subsidiary units such as a Division.

Divisional Troops was a term given to those units that were under the direct command of Divisional HQ, as opposed to the command of one of it's Brigades.